There is a slightly newer 10.1.1 version of drivers available from Blackmagic:
Thanks for posting the screenshot. This shows that After Effects does not see the Mercury Transmit plug-in for Blackmagic. You should verify whether the plug-in is present:
os drive/Library/Application Support/Adobe/Common/Plug-ins/7.0/MediaCore/
The file will be named DeckLinkTransmit.bundle, or something similar.
If the file is present, try uninstalling and reinstalling the (latest version of) Blackmagic drivers.
If After Effects still does not recognize the Blackmagic Mercury Transmit plug-in, open Premiere Pro CC 2014 and check Preferences > Playback, and whether or not video preview works there.
Thanks a lot,Tim.
I think that we finded the solution.